[Albigger]

Originally Posted by pHaestus

No electrical interference from motherboard as far as I can tell; diode reader reports same temperature whether mobo is powered or not.

I calibrate the diode in a water bath over 0-45C always vs. the same temperature probe. So while the offset of the diode is a little different from CPU to CPU the dT CPU-water is always the same provided I get the same voltage delivered on the same mobo (assummmmppppppttttions!)

So you calibrate to a known accurate source, and the offset for each cpu (to obtain true temps) is always a little different, so no cpu diode is calibrated basically? (or at least not calibrated to the accuracy you check to)?

"the dT CPU-water is always the same provided I get the same voltage delivered on the same mobo (assummmmppppppttttions!)"

Is always the same for multiple mountings on one cpu? Or always the same across cpus? yes many assumptions on this part.

I was honestly planning to do all my testing after the first few "with IHS" blocks using a bare die. That's open for debate I s'pose

I wasn't suggesting that you try to characterize the IHS joint or that you produce data with the IHS other than this first attempt. I think bare die testing (or heat die) is the way to test (on AMD cpus).

Originally Posted by bigben2k

Once the IHS is off, there's going to be a CPU temp drop, for each block tested. C/W estimates for each block should remain the same (if calculated that way); any variation would come from the resized contact area, which is going to be smaller without the IHS; a small difference, almost insignificant.

Fuzzy on this part. If inlet water temp is held constant, and temp drops usually when IHS is removed, then won't C/W estimates decrease for a waterblock when the IHS is removed? Of course with the IHS the C/W that is measured is actually that of the wb and the IHS.

--Jay